In a complex resistance-reactance planea XLis represented
By an axis opposite the R axis
By an axis perpendicular to the XC axis
By an axis opposite the XCaxis
By an axis parallel to the R axis
Correct Answer :
C. By an axis opposite the XCaxis
Related Questions
The Q-factor of a parallel resonant circuit is also known as
Voltage magnification factor
Current magnification factor
Gain magnification factor
Resonance magnification factor
The potential gradient in a cable is maximum in
Conductor
Outer sheath
Insulation
Uniformly all over
In an ac circuit with XL and R in seriesa the
Voltages across R and XL are in phase
Voltage across R lags the voltage across XLby 90°
Voltages across R and XL are 180° outof-phase
Voltage across R leads the voltage across XLby 90°
In a pure capacitancea
Current leads voltage by 90�
Current leads voltage by 180�
Current lags voltage by 90�
Current lags voltage by 180�
As applied to a series RLCcircuita bandwidth means
The frequency range for maximum power transfer
The difference between the highest and lowest frequencies of the oscillator
The separation of the half-power points
The frequency at which XL= XC
For a series ACcircuita ___ is not used as a reference phasor.
Voltage
Impedance
Current
Conductance
In a multiple capacitora the plate area is
Increased
The same
Decreased
Variable
The electric field strength between capacitor plates has a unit
Volts per meter
Volts per mil
Amperes per meter
Amperes per mil
A series RLCcircuit has a ______ power factor at its half-power points
Unity
Leading
Lagging
Either B or C
The power factor of a circuit is equal to
RZ
XC/Z
XL/Z
R/Z
Which component opposes voltage change?
Resistor
Inductor
Capacitor
Transistor
The power factor of a certain circuit in which the voltage lags behind the current is 80 %. To increase the power to 100 %a it is necessary to add ___ to the circuit.
Inductance
Capacitance
Resistance
Impedance
What dielectric is generally employed by a variable capacitor?
Mica
Air
Electrolyte
Ceramic
Of the equivalent combination of unitsa which one is not equal to watt?
2/V
AV
A2
J/s
It is impossible to change the voltage across a capacitor instantlya as this would produce ___ current.
Infinite
Zero
Low
High
Refers specifically to steady state values of quantities in ac circuits which are complex numbers.
Domain
Scalar quantity
Vector quantity
Phasor quantity
Rationalizing the denominator of a complex number means
Eliminating the j component in the denominator
Adding j component in the denominator
Eliminating the j component in the numerator
Adding j component in the numerator
The usual load of a dc circuit is a/an
Resistor
Capacitor
Inductor
Both inductor and capacitor
A capacitor is basically constructed of
Two conductors separated by a dielectric
Two dielectric separated by a conductor
Conductors and dielectric
Conductors and semiconductors
The presence of an electric current is made known by
Electric shock
Effects produced
Magnetic shock
Flashing
The value of temperature coefficient ( ) is dependent upon
The nature of material and temperature
The length of material
The cross-sectional area of the material
The volume of the material
What is considered as the most important value of a sine wave?
Effective value
Peak value
Average value
Instantaneous value
What is the reciprocal of capacitance?
Reluctance
Susceptance
Elastance
Conductance
A factor that states how much the resistance changes for a change in temperature?
Resistivity
Specific resistance
Coefficient of temperature change
Temperature coefficient of resistance
What is the temperature coefficient of the resistance Eureka?
Infinity
Negative
Almost zero
Positive
What increases the resistance of wire at high frequencies?
Temperature
Voltage
Skin effect
Insulation
In calculating maximum instantaneous power ___ voltage or current is used.
Peak
Average
Rms
Instantaneous
Which of the following conditions is not true for a series RLCcircuit at resonance?
Z = jXL
XL= XC
The power factor is one
The magnitude of Z is
Series resonance occurs when
XL= XC
XL= R
Z = R
Both A and C
When voltage is applied across a ceramic dielectric the electrostatic field p roduced is 50 times greater than air dielectric. The dielectric constant of ceramic therefore is